I have a coolant leak. It appears to be coming from just about where the valve cover attaches just above to I believe to be the #2 cylinder. 1st one on the driver side. I have no indication that it is going into cylinder. Truck runs fine but I have lost alot of coolant, and it appears that this has been a gradual thing for I have noticed the evidence of coolant sitiing on intake manifold. Question is, could this be a bad intake gasket, manifold?